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Table 1 Comparison of interviews, linkage, and overall dataset

From: Comparison of reproductive history gathered by interview and by vital records linkage after 40 years of follow-up: Bogalusa Babies

  interview livebirth and linkage (n = 1024) interview only, reported at least one livebirth (n = 458) interview only, reported no births (n = 255) linkage only (n = 2207) neither linkage nor interview (n = 1970) p for difference
  N % N % N % N % N %  
number of visits            < 0.01
 1 130 12.7 72 15.7 47 18.4 817 37.0 989 50.2  
 2 136 13.3 23 5.0 23 9.0 515 23.3 371 18.8  
 3–4 256 25.0 114 8.6 71 27.8 537 24.3 346 17.6  
 5–6 195 19.0 89 12.6 44 17.3 216 9.8 160 8.1  
 7 or more 307 30.0 160 34.9 70 27.5 122 5.5 103 5.2  
race            < 0.01
 black 433 42.3 165 36.0 109 42.8 768 34.8 668 33.9  
 white 591 57.7 293 64.0 146 57.3 1439 65.2 1302 66.1  
ever smoker            < 0.01
 yes 368 42.3 206 49.3 80 41.5 490 30.8 436 33.5  
 no 502 57.7 212 50.7 124 58.5 1103 69.2 866 66.5  
highest parental education            < 0.01
  >  high school 347 52.7 139 50.0 72 47.7 312 43.6 162 42.5  
  high school or less 311 47.3 139 50.0 79 52.3 404 56.4 219 57.5  
mean SD
age at youngest visit 8.8 3.8 12.9 9.8 9.6 5.5 8.8 3.5 10.0 5.1 < 0.01
age at oldest visit 25.9 12.6 31.1 13.7 25.3 13.3 15.4 8.1 15.1 9.2 < 0.01
age in 2018 44.6 7.3 50.5 8.3 45.2 8.5 42.5 7.4 44.3 9.3 < 0.01
median IQR
year at first visit 1978 1974–1983 1974 1974–1979 1977 1974–1984 1981 1976–1988 1979 1974–1988 < 0.01
year at most recent visit 2000 1993–2014 2000 1993–2014 1999 1992–2014 1988 1985–1994 1988 1980–1994 < 0.01
mean SD
BMI 21.6 5.2 22.5 5.4 22.7 6.4 19.2 4.2 19.5 4.8 < 0.01
child BMI 17.4 3.2 17.3 3.1 18.5 4.0 17.1 2.9 17.3 3.3 < 0.01
adolescent BMI 21.6 4.5 20.7 3.6 23.4 6.3 21.4 4.5 21.4 4.7 0.39
adult BMI 27.3 7.1 26.4 6.3 28.6 9.8 26.1 7.1 25.5 6.6 < 0.01
cholesterol 171.3 26.0 172.4 29.8 170.7 23.8 167.3 26.5 167.5 28.8 < 0.01
child cholesterol 168.4 26.9 166.7 25.8 167.5 28.9 167.6 27.0 168.0 27.9 0.90
adolescent cholesterol 162.3 27.8 157.3 25.4 161.0 28.1 162.5 27.2 160.7 28.3 0.02
adult cholesterol 182.1 31.5 184.4 35.7 177.8 32.5 176.6 34.4 179.2 35.9 < 0.01
systolic blood pressure 103.9 8.8 107.1 10.2 104.4 9.3 100.8 9.0 101.6 10.1 < 0.01
child SBP 97.3 8.0 97.7 8.9 97.9 8.6 96.9 8.6 96.8 8.8 0.19
adolescent SBP 107.6 8.2 107.6 7.7 107.8 8.9 106.8 8.2 107.5 8.7 0.11
adult SBP 110.1 9.8 111.6 10.5 110.7 10.5 109.0 9.8 110.2 9.8 < 0.01
  1. BMI body mass index, SBP systolic blood pressure, SD standard deviation, IQR interquartile range